7218444229 has 2 divisors, whose sum is σ = 7218444230. Its totient is φ = 7218444228.

The previous prime is 7218444227. The next prime is 7218444257. The reversal of 7218444229 is 9224448127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5761113604 + 1457330625 = 75902^2 + 38175^2 .

It is an emirp because it is prime and its reverse (9224448127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7218444229 - 2¹ = 7218444227 is a prime.

Together with 7218444227, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7218444221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3609222114 + 3609222115.

It is an arithmetic number, because the mean of its divisors is an integer number (3609222115).

Almost surely, 2^7218444229 is an apocalyptic number.

It is an amenable number.

7218444229 is a deficient number, since it is larger than the sum of its proper divisors (1).

7218444229 is an equidigital number, since it uses as much as digits as its factorization.

7218444229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 43.

The square root of 7218444229 is about 84961.4278893664. The cubic root of 7218444229 is about 1932.6262250370.

The spelling of 7218444229 in words is "seven billion, two hundred eighteen million, four hundred forty-four thousand, two hundred twenty-nine".